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/*******************************************************************************
* Copyright (c) 2000, 2009 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jdt.internal.compiler.ast;
import org.eclipse.jdt.internal.compiler.ASTVisitor;
import org.eclipse.jdt.internal.compiler.impl.*;
import org.eclipse.jdt.internal.compiler.codegen.*;
import org.eclipse.jdt.internal.compiler.lookup.*;
import org.eclipse.jdt.internal.compiler.parser.ScannerHelper;
public class CharLiteral extends NumberLiteral {
char value;
public CharLiteral(char[] token, int s, int e) {
super(token, s, e);
computeValue();
}
@Override
public void computeConstant() {
//The source is a char[3] first and last char are '
//This is true for both regular char AND unicode char
//BUT not for escape char like '\b' which are char[4]....
this.constant = CharConstant.fromValue(this.value);
}
private void computeValue() {
//The source is a char[3] first and last char are '
//This is true for both regular char AND unicode char
//BUT not for escape char like '\b' which are char[4]....
if ((this.value = this.source[1]) != '\\')
return;
char digit;
switch (digit = this.source[2]) {
case 'b' :
this.value = '\b';
break;
case 't' :
this.value = '\t';
break;
case 'n' :
this.value = '\n';
break;
case 'f' :
this.value = '\f';
break;
case 'r' :
this.value = '\r';
break;
case '\"' :
this.value = '\"';
break;
case '\'' :
this.value = '\'';
break;
case '\\' :
this.value = '\\';
break;
default : //octal (well-formed: ended by a ' )
int number = ScannerHelper.getNumericValue(digit);
if ((digit = this.source[3]) != '\'')
number = (number * 8) + ScannerHelper.getNumericValue(digit);
else {
this.constant = CharConstant.fromValue(this.value = (char) number);
break;
}
if ((digit = this.source[4]) != '\'')
number = (number * 8) + ScannerHelper.getNumericValue(digit);
this.value = (char) number;
break;
}
}
/**
* CharLiteral code generation
*
* @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope
* @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
* @param valueRequired boolean
*/
@Override
public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
int pc = codeStream.position;
if (valueRequired) {
codeStream.generateConstant(this.constant, this.implicitConversion);
}
codeStream.recordPositionsFrom(pc, this.sourceStart);
}
@Override
public TypeBinding literalType(BlockScope scope) {
return TypeBinding.CHAR;
}
@Override
public void traverse(ASTVisitor visitor, BlockScope blockScope) {
visitor.visit(this, blockScope);
visitor.endVisit(this, blockScope);
}
}
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